Pool cue coupling with tunable coupling insert



FIG. 1 is a top plan view of a tunable coupling joint for a pool cue showing my new design. The undisclosed opposite side being identical;

FIG. 2 is an end view of FIG. 1, the undisclosed opposite end being identical;

FIG. 3 is an exploded perspective view of FIG. 1; and,

FIG. 4 is a reduced top plan view of FIG. 1, the broken line showing of a fragmented broken away pool cue is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a pool cue coupling with tunable coupling insert, as shown and described. 